So, I'm looking for a wireless single camera system, 5" to 7" monitor that's under $400 and hopefully closer to $300 that works good on a 40' Solitude. Want it to keep an eye on rear cargo mostly as well as traffic so constantly on while moving. We typically travel around 60 mph more or less, give or take a couple mph. Not really worried about backing as we never back without a spotter with walkie. Anyone happy with what they are using? Would love some recommendations. Thanks